I have a load with Superformance. I Don't have it written down with me now. I have been using 6.5 Creedmore data to get a starting load with the 260 since they are almost identical case volume. Sometimes I have to adjust up or down a hair on starting load depending on how each bullet fills the case capacity wise. I will post up the load when I remember to check my load records.
I shot a small buck using a rifle with a muzzle velocity about 3,250 per second. The buck was no more than fifty yards away. The bullet hit the shoulder joint going in There was about a 2 1/2" diameter hole going into the ribs. Needles to say, it dropped at the shot.